M8 Metric Thread
M8 Metric Thread Dimensions and Pitch
Below are the key dimensions for M8 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.
M8 Coarse (standard)
Welcome to our M8 Metric Thread Page, your dedicated hub for swift measurements on M8 metric threads. We've gathered a vast database for all common metric threads you'll employ in your components, focusing on key measurements such as thread pitch, tap drill, and clearance drill. This page is an all-in-one solution for professionals and enthusiasts in need of dependable, accurate data.
M8 Coarse Pitch Dimensions
Nominal Size
d=D
p
r
d2=D2
d3
D1
h3
H1
Tap Drill
M8
8
1.25
0.18
7.188
6.466
6.647
0.767
0.677
6.8
All dimensions stated in are mm (millimetre)
M8 Fine Pitch Dimensions
All dimensions stated in are mm (millimetre)
ISO Metric Thread profile
d=D: Major Diameter
p: Pitch
r: Root Radius
d2=D2: Pitch Diameter
d3: Minor Diameter Male Thread
D1: Minor Diameter Female Thread
h3: Thread Height Male
H1: Thread Height Female
Major Diameter
The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).
Pitch
This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.
Minor Diameter
Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).
Thread Angle
The angle between the thread faces. 60 degrees in the example above.
Right-Hand Thread
The thread will assemble when rotated clockwise. "righty tighty lefty loosely"
Left-Hand Thread
The thread will assemble when rotated counter-clockwise.
Frequently Asked Questions
What is the pitch of an M8 thread?
The pitch for an M8 thread is 1.25 mm.
What is the tap drill for an M8 thread?
The tap drill for an M8 thread is 6.8 mm.
What size is a clearance hole for an M8 thread?
The clearance drill for an M8 thread is 9 mm.
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